66 



THE ROYAL SOCIETY OF CANADA 



ment Demonstration Farm, Brooks, Alberta. Five groups of soil 

 samples were collected, each group consisting of four members, as 

 follows: A-0'.0-0'.5, B-0'.5-l'.5, C-r.5-3'.0, and D-3'.O- 

 5'.0. The location of the groups in respect to the burn-out is shown 

 in the accompanying diagram, all the points of collection being in the 

 one straight line. 



à ore /)o/c 



Cross Secf/on 



of ' ' 



"A". — The surface soil in groups 1681 and 1682 is a dark grey- 

 brown loam, containing much medium and fine sand but with clay 

 characteristics predominating; fairly well supplied with semi-decom- 

 posed vegetable organic matter. In groups 1684 and 1685, on the 

 opposite side of the burn-out, the proportion of clay to sand is much 

 the same as in groups 1681 and 1682 but is characterized by a much 

 higher organic content. 



This member ("A") of the group 1683, taken in the centre of 

 the burn-out, offered several points of contrast when compared with 

 "A" of the unaffected adjacent area, but chiefïy differed in its much 

 lower organic content, giving it the quality and appearance of a subsoil. 



" B," the soil representing a depth between 0'.5 and 1'.5, for 1681 

 and 1682 is a light grey clay with a considerable proportion of fine 

 and medium sand; fairly porous, indicating possibilities of good 



